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authorAndi Kleen <ak@suse.de>2008-07-24 08:27:50 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 21:47:18 +0400
commitceb868796181dc95ea01a110e123afd391639873 (patch)
tree991be618e5195b05c31974a19adb4b9602315013 /mm
parent4abd32dbab201c3ced0b0af12accea77cd9eeffc (diff)
downloadlinux-ceb868796181dc95ea01a110e123afd391639873.tar.xz
hugetlb: introduce pud_huge
Straight forward extensions for huge pages located in the PUD instead of PMDs. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/hugetlb.c9
-rw-r--r--mm/memory.c15
2 files changed, 20 insertions, 4 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 0c74c14dd2f7..107c1ce223cb 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1996,6 +1996,15 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
return ret;
}
+/* Can be overriden by architectures */
+__attribute__((weak)) struct page *
+follow_huge_pud(struct mm_struct *mm, unsigned long address,
+ pud_t *pud, int write)
+{
+ BUG();
+ return NULL;
+}
+
int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
struct page **pages, struct vm_area_struct **vmas,
unsigned long *position, int *length, int i,
diff --git a/mm/memory.c b/mm/memory.c
index 02fc6b1047b0..262e3eb6601a 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -998,19 +998,24 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
goto no_page_table;
pud = pud_offset(pgd, address);
- if (pud_none(*pud) || unlikely(pud_bad(*pud)))
+ if (pud_none(*pud))
+ goto no_page_table;
+ if (pud_huge(*pud)) {
+ BUG_ON(flags & FOLL_GET);
+ page = follow_huge_pud(mm, address, pud, flags & FOLL_WRITE);
+ goto out;
+ }
+ if (unlikely(pud_bad(*pud)))
goto no_page_table;
-
+
pmd = pmd_offset(pud, address);
if (pmd_none(*pmd))
goto no_page_table;
-
if (pmd_huge(*pmd)) {
BUG_ON(flags & FOLL_GET);
page = follow_huge_pmd(mm, address, pmd, flags & FOLL_WRITE);
goto out;
}
-
if (unlikely(pmd_bad(*pmd)))
goto no_page_table;
@@ -1567,6 +1572,8 @@ static int apply_to_pmd_range(struct mm_struct *mm, pud_t *pud,
unsigned long next;
int err;
+ BUG_ON(pud_huge(*pud));
+
pmd = pmd_alloc(mm, pud, addr);
if (!pmd)
return -ENOMEM;